Elliptic flow of identified hadrons in Au+Au collisions at √s[subscript NN]=7.7–62.4 GeV
Name
Adamczyk-2013-Elliptic flow of ide.pdf
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Author(s)
Balewski, Jan T.
Betancourt, Michael Joseph
Corliss, Ross
Hays-Wehle, James Prewitt
Leight, William Axel
Stevens, Justin
van Nieuwenhuizen, Gerrit Jan
Date Issued
July 2013
Journal
Physical Review C
Publisher
American Physical Society
Citation
Adamczyk, L., J. K. Adkins, G. Agakishiev, M. M. Aggarwal, Z. Ahammed, I. Alekseev, J. Alford, et al. “Elliptic flow of identified hadrons in Au+Au collisions at sqrt[s_{NN}]=7.7–62.4 GeV.” Physical Review C 88, no. 1 (July 2013). © 2013 American Physical Society
Version
Final published version
Abstract
Measurements of the elliptic flow, v[subscript 2], of identified hadrons (π[superscript ±], K[superscript ±], K[0 over s], p, p̅ , ϕ, Λ, Λ̅ , Ξ[superscript −], Ξ̅ [superscript +], Ω[superscript −], Ω̅ [superscript +]) in Au+Au collisions at √s[subscript NN]=7.7, 11.5, 19.6, 27, 39, and 62.4 GeV are presented. The measurements were done at midrapidity using the time-projection chamber and the time-of-flight detectors of the Solenoidal Tracker at RHIC experiment during the beam-energy scan program at Relativistic Heavy Ion Collider. A significant difference in the v[subscript 2] values for particles and the corresponding antiparticles was observed at all transverse momenta for the first time. The difference increases with decreasing center-of-mass energy, √s[subscript NN] (or increasing baryon chemical potential, μ[subscript B]), and is larger for the baryons as compared to the mesons. This implies that particles and antiparticles are no longer consistent with the universal number-of-constituent quark (NCQ) scaling of v[subscript 2] that was observed at √s[subscript NN]=200 GeV. However, for the selected group of particles (π[superscript +], K[superscript +], K[0 over s], p, Λ, Ξ[superscript −], Ω[superscript −]) NCQ scaling at (m[subscript T]−m[subscript 0])/nq>0.4 GeV/c[superscript 2] is not violated within ±10%. The v[subscript 2] values for ϕ mesons at 7.7 and 11.5 GeV are approximately two standard deviations from the trend defined by the other hadrons at the highest measured p[subscript T] values.
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevC.88.014902
